1.1 This Standard applies to a series of straight face and crowned face welded steel sing pulltys which have a number of steel wing plates that extend radially from the longitudinal axis of two compression type hub assemblies and are equally spaced about the pulley circumference. The purpose of the compression type hubs is to provide a clamp fit on the shaft. The wings are supported or joined by welded steel plates so arranged as to form the shape of two frustums of cones or regular pyraminds being joined at their bases. A bar of sufficient radius is attached to the outer longitudinal edge of each wing to provide more contact area with the belt.This standard is restricted to pulleys which do not transmit torque. This standard is not applicable to pulleys with continuous(uninterrupted) rims, cast pulleys, or pulleys utilizing non-compression hubs.This standard establishes load ratings, allowable variation from nominal dimensions, permissible crown dimensions and such overall dimensions as are normally necessary to establish clearances for location of adjacent parts.The pulley diameters, face widths and shaft sizes shown are those that are nominally used in current belt conveyor and elevator practice. These only are covered by this standard: all other sizes and capacities are not covered by this standard.1.2 Welded steel wing pulleys covered by this standard should not be used with steel cable and other high modulus belts because such belts create stress concentrations and demand manufacturing tolerances beyond the capacities of these pulltys.